Transcript File - Ms. Leigh`s

PTT
17AUG2015
1. What biotic things did you observe this
weekend?
2. What non-human biotic things did you
observe this weekend?
Abiotic + biotic = Ecosystem
Science Circle!
• We take samples to
make inferences
about populations!
Mark and Recapture
• We will use this sampling method to estimate
the population of our turtle pond
PTT
18AUG2015
• Why do we take samples?
• What can a sample tell us about a population
of turtles?
• You have time to finish your graph, calculate
an estimate for the 5th year, and answer the 2
questions.
• 20 minutes!
Think, Pair, Share
• In your science notebook what are some really
good things about this sampling method?
• What are some things that the method may
not measure?
• Do you think you could use the method in
your final project?
Take notes about the methods in
the video
•
•
•
•
Sampling with Quadrats
Mark and Recapture
Distance Sampling
Camera Traps
PTT
19AUG2014
1. How can you make sure that a plant or
animal is the plant or animal you think it is?
2. Have you ever read a “choose your own
adventure” book?
Ecologists use dichotomous keys to identify organisms.
There are a series of questions that give TWO choices to
slowly narrow down the identification of the organism.
We will use this in the next two days
1. The organism has legs
a. Yes, a human
b. No, a plant
1. The organism has legs
a. Yes, go to 2
b. No, a plant
2. The organism is in uniform
a. Yes, the organism is a student
b. No, the organism is Ms. Leigh
Your task:
1. Identify the items on your table USING THE
DICHOTOMOUS KEY
2. Sketch the items in your notebook and label them
with the name on the key
Solid food distributer
PTT
20AUG2014
1. What do we call a group of organisms that are the
same species?
2. When populations of biotic organisms interact, what
do we call that?
(hint: think order of everything)
3. Why do we take samples of a dinner that we are not
sure if we will like?
Your task:
• Follow along on page 689 “Measuring
Populations”
Ecological Sample for LSE
Our goal over the next few weeks is to complete
an ecological community assessment of the LSE
campus.
What we will sample:
•
•
•
•
•
Insects
Trees
Birds
Mammals
Bacteria (yes,
bacteria…assuming Ms.
Leigh can get the supplies)
We take samples to make
inferences about populations
• There is no possible way to sample every
single organism at LSE
• So we sample and draw conclusions from the
sample we will collect
• All the 7th grade classes will combine their
data for analysis (to be posted on
msleighscience.weebly.com)
Why start with insects?
• They are the most AWESOME
• Insects are diverse and easily sampled
Study Question:
• What organisms exist in the LSE ecological
community?
• How do these organisms interact?
Methods:
• 7th grade science students will sample insects,
birds, plants, mammals, and bacteria
• All 7th grade students will pool their data
Methods for insect sampling
• There exist 2 kinds of insects:
• Flying
• Not flying
• We are going to sample the non-flying insects
We take samples to make
inferences about populations…
if we can make inferences about
populations, we can ask questions
about communities
Insect sampling with Pit Traps
• Students will place cups in the LSE field 25
feet apart.
• Cups will be filled with soapy water
• Insects will be collected and identified in the
next 24 hours
PTT
21AUG2014
1. Why do we take samples?
2. What level of organization did we sample
yesterday (organism, ecosystem, population,
community?)
3. What do scientists do when their
experiments don’t go as planned?